Determined Armada man took ships! (7)

I believe the answer is:

adamant

I'm a little stuck... Click here to teach me more about this clue!

'determined' is the definition.
(I've seen this before)

'armada man took ships' is the wordplay.
'ADAMANT' is hidden within the letters.
However, I'm unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for adamant that I've seen before include "Positive or intransigent" , "Obdurate and unyielding" , "Hard stone" , "Refusing to be persuaded" , "Unshakable (in an opinion)" .)

I've seen this clue in The Sun.

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